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only my 2 cents worth but you really shouldn't need a tune after a header install.It's still in the ecm relms ot peramiters I beleive.But I could be wrong.
Looking for someone around the Binghamton area who can give my 04 GTO a tune after header install.
A friend of mine is parting out a GTO if your interested in parts. I will be up in binghamton the end of September. kooks headers, magnaflow, wheels, differential with gears and wavetrac, intakes, spoilers, export taillights.